exam Maths Puzzle Numerical Ability

Jackie has coffee that sells for $9 per pound and coffee that sells for $4 per pound. How many pounds of each must be mixed to get 20 pounds that sells for $8.25 per pound?

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Can someone help me on this problem?

I submitted a problem yesterday it was- graph 3x + 2y = 6. The tutor did great, but my instructor said I must label the intersection point I am stuck on correct answer for:

(x-5)(3x + 4)=0 is:

I am not using a specific book. I am just practicing...